Home / 489.80-613.20

Finding the Third Proportional to 489.80 and 613.20

Calculator

Solution

The third proportional to 489.80 and 613.20 is: 767.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.80 : 613.20 = 613.20 : x
  2. Step 2: Convert to fraction form
    489.80/613.20 = 613.20/x
  3. Step 3: Cross multiply
    489.80x = 613.20 × 613.20
  4. Step 4: Simplify right side
    489.80x = 376,008.49
  5. Step 5: Solve for x
    x = 376,008.49/489.80
  6. Step 6: Final answer
    x = 767.68

Related Problems

Find third proportional to 244.90 and 306.60
Half scale
Find third proportional to 979.59 and 1,226.39
Double scale
Find third proportional to 492 and 616
Similar ratio
Find third proportional to 734.70 and 919.79
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.25) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.